Microsoft HoloLens is a first-of-its-kind, untethered holographic computer powered by Windows 10 that utilizes augmented reality to overlay holographic images in the user's environment. It features advanced sensors, cameras, and a holographic processing unit that enable responsive interactions using voice, gestures, and gaze. While HoloLens offers innovative applications in various fields, it also comes with challenges, such as potential damage and privacy concerns.